user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/scripts/check-options-header-include.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+shopt -s lastpipe
+
+errors_found=0
+
+find . -wholename '*include/*.h' -print0 | while read -rd $'\0' file; do
+	uses=$(grep -c -E "__MLIBC_(ANSI|BSD|POSIX|LINUX|GLIBC)_OPTION" "$file")
+	if [ "$uses" -ne 0 ]; then
+		does_include=$(grep -c "#include <mlibc-config.h>" "$file")
+		if [ "$does_include" -eq 0 ]; then
+			echo "'$file' does not include mlibc-config.h while it does use mlibc option macros"
+			errors_found+=1
+		fi
+	fi
+done
+
+exit $errors_found